"He's excellent," Jon Bon Jovi said at a press conference in Melbourne today.

"I didn't have ear monitors on, the guy was right here (next to me). He really belted it out, he was in tune, he can sing, he knew the words and everything.

"If you're around long enough people come and they grow into prominent positions. If you think about it, we were making records as long as the Prince has been with us. As I looked around that stage and saw the Prince and Taylor Swift they both didn't know a world without Bon Jovi records. They sort of grew up in that.

"I get that, that's the way we feel about the Stones or the Beatles. I was born with the Beatles. So I get the concept. If you're around long enough and able to be blessed with the opportunity to do what you love to do sometimes if you do good, good things happen and you fall into situations where the future King of England knows the words to your songs .

``He's very engaging, he's very intelligent and he's a great sport. I know that he knew the song."

News_Rich_Media: Prince William joins Jon Bon Jovi and Taylor Swift for a royal version of 'Living on a Prayer'. Courtesy ITV News.

Bon Jovi start their Because We Can tour in Melbourne tomorrow night - Australia will also be the final leg of the world tour.

The 104 date tour has already made over $140 million and is on track to be 2014's most successful tour.

WHICH SONG DO YOU WANT BON JOVI TO SING? COMMENT BELOW

Bon Jovi said the band were grateful they were still able to tour at the top level due to a wide fanbase.

"It's cross generational, that's the magic of it," he said. "It's 6 to 60. I'm saying thank you, it's the biggest tour on the planet, holy Christmas tree. This is crazy business doing stadiums 30 years on. I think that generation tells the next generation `You gotta see this band live'. That's the blessing. It's more than guys that grew up in the `80s."

Bon Jovi also referenced the temporary departure of guitarist Richie Sambora - he will be replaced by Phil X, who filled in for Sambora previously due to a stint in rehab.

"God bless Phil, he knew the songs," Bon Jovi said. "That saved the day. Fortunately for us, unfortunately for us, Phil had to do it (fill in for Sambora) in the previous tour. He's been a consummate pro and we're grateful to him."

The rock star also said he was still fighting fit age 51.

"I feel like a heavyweight fighter," he said. "Some days you feel beat up, other days you feel like the king of the world. Every show it comes down to that desire to be the best. That's how we approach every show, every tour. We do it because we love to do it. As long as we're doing it at a level to which we've grown accustomed we'll keep doing it."

Two young Australian acts were chosen from Telstra's Road to Discovery competition to open for Bon Jovi at each show - 21-year-old Tasmanian Jesse Teinaki and 19-year-old Melburnian Angie McMahon.

They will alternate playing at each show, but will be on stage from 6pm to 6.15pm, with Kid Rock on at 6.30pm and Bon Jovi from 8pm.

News_Image_File: Young Australian act chosen ... Angie McMahon (left) and Jesse Teinaki (centre) with Jon Bon Jovi, David Bryan and Tico Torres at the Crown in Melbourne. (Photo by Michael Dodge/Getty Images)

"There'll be double the amount of people in one room than there is in my home town back in Tassie," Teinaki said. ``Etihad was where I saw my first ever gig - I came over to see Green Day, My Chemical Romance and Jimmy Eat World. Going from that being the first gig to playing for Bon Jovi on that stage, it's surreal. It hasn't sunk in. I think everyone's a Bon Jovi fan."

McMahon, who also fronts a band called The Fabric, is looking forward to the challenge.

"Earlier this year I was busking on the streets of Melbourne to 30 people if I was lucky, now I'm playing to 50,000 people before Bon Jovi. It's a big step. God knows how nervous I'll be, hopefully I can handle it, I'm counting on there being lights in my face so I can't see how many people are there! I'm a massive fan, they write bloody great songs, you never get sick of Bon Jovi."

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